Get Tire Size Chart In Inches US. To calculate a metric tire size into inches you multiply the first number by the second number devided by 100 which gives you the sidewall height in millimeters, divide it by 25.4 to convert it to inches. It's a holdover from an old french system that designated tire sizes using the letters a, b and c.

From overall diameter to revolutions per mile, you’ll also be able to compare tire sizes and learn the proper height, width, and fit when converting tire sizes.
Note that the c does not stand for centimeters; Use our tire size calculator to find the suggested tire size specs for your vehicle. Convert the above calculated tire height (aspect ratio) in millimeters to inches by multiplying the millimeters by.03937 (139.75 x.03937 = 5.5 inches). Then take the inches and multiply by two and add the rim size.
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